02. Choose the correct alternatives (more than one may be correct) and write the corresponding letters only:

(xi) A computer system has $6$ tape devices, with n processes competing for them. Each process may need $3$ tape drives. The maximum value of n for which the system is guaranteed to be deadlock-free is:

Consider there are 4 processes and each process has 1 resource. There will be two resources remaining. One of the four process may ask for 2 resources and the resulting state will be a safe state. (Infact, one of the resource can request only one tape device and even after that it will be in safe state.) So the max process will be 4(option C) right?

@GaneshA We can come up with many such allocation which will not cause deadlock. Question is asking "guaranteed to be deadlock free". Even if there is is a single case causing deadlock, it will not be considered.

Worst case allocation is all process gets one less than their maximum demand and all are blocked as after such assignment no one goes to completion.